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EP 0 972 089 B1 |
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EUROPEAN PATENT SPECIFICATION |
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Mention of the grant of the patent: |
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08.12.2004 Bulletin 2004/50 |
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Date of filing: 18.03.1998 |
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International application number: |
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PCT/CA1998/000238 |
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International publication number: |
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WO 1998/045492 (15.10.1998 Gazette 1998/41) |
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ALUMINUM ALLOY COMPOSITION AND METHOD OF MANUFACTURE
ALUMINIUMLEGIERUNG UND DEREN HERSTELLUNGSVERFAHREN
COMPOSITION EN ALLIAGE D'ALUMINIUM ET PROCEDE DE FABRICATION
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Designated Contracting States: |
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AT CH DE ES FR GB IT LI NL SE |
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Priority: |
04.04.1997 US 42689 P
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Date of publication of application: |
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19.01.2000 Bulletin 2000/03 |
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Proprietor: ALCAN INTERNATIONAL LIMITED |
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Montreal
Quebec H3A 3G2 (CA) |
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(72) |
Inventors: |
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- DAVISSON, Thomas, L.
Aurora, IL 60504 (US)
- MONTGRAIN, Luc
Terre Haute, IN 47802 (US)
- PULLIAM, Daniel
Terre Haute, IN 47803 (US)
- NADKARNI, Sadashiv
Lexington, MA 02173 (US)
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(74) |
Representative: Gaunt, Robert John |
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Stevens, Hewlett & Perkins
Halton House
20/23 Holborn London EC1N 2JD London EC1N 2JD (GB) |
(56) |
References cited: :
WO-A-95/25825
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GB-A- 1 479 429
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- PATENT ABSTRACTS OF JAPAN vol. 014, no. 137 (C-0702), 15 March 1990 & JP 02 011735
A (FURUKAWA ALUM CO LTD), 16 January 1990,
- PATENT ABSTRACTS OF JAPAN vol. 018, no. 145 (C-1178), 10 March 1994 & JP 05 320798
A (FURUKAWA ALUM CO LTD), 3 December 1993,
- DAVIES J.R.: "Aluminum and Aluminum Alloys" 1993 , ASM INTERNATIONAL , USA XP002068409
see page 33 - page 36
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Note: Within nine months from the publication of the mention of the grant of the European
patent, any person may give notice to the European Patent Office of opposition to
the European patent
granted. Notice of opposition shall be filed in a written reasoned statement. It shall
not be deemed to
have been filed until the opposition fee has been paid. (Art. 99(1) European Patent
Convention).
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[0001] This invention relates to aluminum alloy sheet products and methods for making them.
Specifically, this invention relates to a new aluminum alloy for household foil.
BACKGROUND ART
[0002] Household aluminum foils are often produced from alloys that are cast as ingots by
a process commonly referred to as direct chill or DC casting. The ingots are generally
hot rolled and then cold rolled. Multiple passes through the hot rolling mill and
the cold rolling mill are required to produce a foil. Often, after the first pass
through the cold rolling mill, the alloy is subject to an interanneal. Then the alloy
is rolled to its final desired gauge and optionally annealed again to produce a household
foil. A common final gauge of household foil is 0.00155 cm (0.00061 inches) although
foil is generally considered to be any sheet less than about 0.0254 cm (0.01 inches).
[0003] An interanneal is usually performed after the first and/or the second cold rolling
pass. The interannealing process is carried out in order to ensure easy reliability
to the final, desired gauge. Without this interanneal, the sheet may incur an excessive
amount of work hardening and make further rolling difficult, if not impossible.
[0004] Compositions of some alloys currently used to produce household aluminum foil from
DC cast ingots, and selected properties of these alloys in the fully annealed state
at a foil gauge of 0.00155 cm (0.00061 inches) are given below in Table 1 below.
Table 1
Nominal Composition and Selected Properties of Annealed Foils |
Alloy |
Si |
Fe |
Cu |
Mn |
UTS1 MPa(ksi) |
YS2 (ksi) |
Mullen |
1100 |
0.06 |
0.45 |
0.12 |
-- |
73.8
(10.7) |
40.7
(5.9) |
14.1 |
1200 |
0.17 |
0.65 |
-- |
-- |
69.6
(10.1) |
42
(6.1) |
8.6 |
B111 |
0.57 |
0.57 |
-- |
-- |
73.8
(10.7) |
46.9
(6.8) |
12.7 |
8015 |
0.12 |
0.95 |
-- |
0.2 |
124.1
(18) |
103.4
(15) |
15 |
8006 |
0.22 |
1.58 |
-- |
0.43 |
127.6
(18.5) |
92.4
(13.4) |
|
1 Ultimate Tensile Strength |
2 Yield Strength |
[0005] Alloys commonly used for producing household aluminum foils include 1100 and 1200
type alloys. As evidenced by Table 1, these commonly used foil alloys tend to be weaker
than alloys such as 8015 or 8006. While alloys 8015 or 8006 tend to have greater strength
than the standard foil alloys, the high iron content in alloys 8015 and 8006 results
in foils that are unsuitable for re-melting with aluminum beverage can scrap. Thus,
the economical consideration of re-melting forces use of the lower strength/less resilient
1100 or 1200 alloys to produce household aluminum foil.
[0006] Alloys 8015 and 8006 yield a stronger foil because their properties do not deteriorate
as rapidly as 1100 or 1200 alloys after annealing. Deterioration is slowed or stopped
by the dispersoids produced in 8015 and 8006 alloys during the interanneal, and also
by the manganese and copper that remain in solid solution. Alloys such as 1100 and
1200 can be easily work hardened to produce a relatively strong foil after cold rolling.
Once these alloys are annealed, however, their yields strength decreases rapidly.
[0007] The principal reason for this rapid decrease in yield strength is that 1100 and 1200
alloys have little or no solution strengthening elements, such as copper or manganese,
remaining in solution. Also, these alloys have very few dispersoids. For example,
1100 alloy typically has a particulate content of about 0.8%, while 1200 alloy has
a 1.6% content, and 8111 has a 1.8% content.
[0008] In contrast, alloy 8006 typically has a particulate content of 3.5% and alloy 8015
has a content of 2.6%. Furthermore, 8015 alloy when produced on a continuous caster
retains almost all of its manganese in solid solution to provide considerable solution
strengthening. Thus, due to the large quantities of dispersoids fortified by elements
in solid solution, these alloys are able to retain their strength to a much greater
extent after annealing.
[0009] Another important aspect when considering aluminum alloys for producing household
foils is the castability of that alloy. Typically, alloys with a wider freezing range
and higher silicon content are easier to cast than alloys with narrow freezing ranges
and low silicon content. For example, alloy 8015 has a narrow freezing range and is
difficult to cast on a continuous caster. Finally, to prevent the formation of a dull
surface due to magnesium oxidation, the amount of magnesium needs to be strictly limited.
[0010] Published PCT application WO 95/25825 to Mahon et al., which published on September
28, 1995, discloses an aluminium foil which is composed of an alloy of composition
Fe 1.2 - 2.0 %; Mn 0.2 - 1.0 %; Mg and/or Cu 0.1 - 0.5 %; Si up to 0.4 %; Zn up to
0.1 %; balance Al of at least commercial purity. The foil has an average grain size
below 5
µm and is continuously recrystallised with a substantially retained rolling texture.
The solute elements Mg and/or Cu increase metal strength without inhibiting continuous
recrystallisation.
DISCLOSURE OF THE INVENTION
[0011] An object of the present invention is to provide an improved alloy suitable for the
production of aluminum foil and a method for manufacture of the alloy.
[0012] According to one aspect of the invention there is provided a recyclable aluminum
foil having a thickness of less than 0.0254 cm (0.01 inches) characterized in that
said foil results from a continuous strip casting process and is made of an alloy
containing 0.2%-0.5% Si, 0.4%-0.8% Fe, 0.1%-0.3% Cu, and 0.05%-0.3% Mn by weight,
with the balance aluminum and incidental impurities, said foil containing at least
2% by weight of strengthening particulates and having at least 0.1% by weight of said
copper and/or manganese retained in solid solution.
[0013] According to another aspect of the invention there is provided an alloy sheet having
a thickness of less than 0.0254 cm (0.01 inches), characterized in that said sheet
results from a continuous strip casting process and contains 0.2%-0.5% Si, 0.4%-0.8%
Fe, 0.1%-0.3% Cu, and 0.1%-0.3% Mn by weight, with the balance aluminum and incidental
impurities, having a yield strength of at least 10 ksi in the fully annealed condition.
[0014] According to yet another aspect of the invention there is provided a method of manufacturing
a sheet of aluminum-based alloy, in which a sheet of alloy is cast by continuous strip
casting to form a cast sheet less than 5 cm (2 inches) thick, the cast sheet is coiled,
the coiled sheet is cold rolled to final gauge by a procedure involving several passes,
the sheet being interannealed at a temperature in the range of 250 to 450°C after
a first pass and rolled to final gauge in one or more subsequent passes, characterized
in that said alloy contains, by weight, at least 0.2% and up to 0.5% silicon, at least
0.4% and up to 0.8% iron, at least 0.1% and up to 0.3% copper, at least 0.1% and up
to 0.3% manganese, and the balance aluminum and incidental impurities.
[0015] An important aspect of the present invention is thus a new aluminum alloy composition
suitable for use as household foil having improved strength due to a larger quantity
of dispersoids fortified by elements in solid solution. The invention also provides
an economical method for the manufacture of a household aluminum foil made of this
alloy using a continuous caster.
[0016] The alloy of the invention, unlike alloys typically used for the production of foil,
can be continuously cast with an interanneal to yield foil with the formability and
drawability of the 1100 and 1200 alloys while retaining the high strength characteristics
of the 8015 and 8006 alloys. This is accomplished through a balanced strengthening
mechanism in which the ratio of iron to silicon is adjusted such that at least about
2% of strengthening particulates are formed in the foil and at least 0.1% by weight
of copper and/or manganese are retained in sold solution.
[0017] In summary, the present invention teaches a new aluminum based alloy composition
for use as a household aluminum foil and a low cost method of manufacturing the foil.
The present application retains the continuous casting and process properties of conventional
alloys used for household foils, while exhibiting the strength properties of alloys
having a higher iron content that are consequently less desirable in the recycling
stream.
BEST MODES FOR CARRYING OUT THE INVENTION
[0018] The present invention provides a new aluminum alloy for use in household foil and
a method of manufacture of such foil. The composition as described in this invention
yields all of the desirable properties required for a household aluminum foil. The
alloy is suitable for casting on a continuous caster followed by cold rolling of the
alloy with an interanneal after a first pass of cold rolling. After being rolled to
a final gauge, the resulting foil is stronger than the current household foils while
retaining desirable recyclability attributes.
[0019] Broadly stated, the composition of the alloy of the present invention contains:
at least 0.2% and up to 0.5% by weight silicon,
at least 0.4% and up to 0.8% by weight iron,
at least 0.1% and up to 0.3% by weight copper,
at least 0.05% and up to 0.3% by weight manganese,
no more than 0.01% by weight magnesium, and
the balance aluminum and incidental impurities.
[0020] The present alloy contains silicon at least about 0.2% and up to about 0.5% by weight
silicon and preferably between 0.25% and 0.4%. Alloys with a wider freezing range
and higher silicon content are easier to cast than those with narrower freezing ranges
and lower silicon content. However, further increase of the silicon content can result
in precipitation of silicon in the alloy which can increase wear during subsequent
working and forming operations. Thus, to allow the alloy to be continuously cast in
a conventional manner, the silicon content should be maintained in the aforementioned
range.
[0021] The present alloy contains iron in an amount of at least about 0.4% and up to about
0.8% by weight and preferably between 0.5% and 0.7%. The iron aids in giving the alloy
higher strength characteristics such as those found in the 8015 and 8006 alloys, but
the increase in strength must be balanced with the effect that iron levels can have
on recycling. High iron alloys, such as 8006 and 8015, are not as valuable in recycling
because they cannot be recycled into the low iron alloys without blending in primary
low iron metal to reduce the overall iron level. Recyclable beverage can sheet requires
lower levels of iron than the levels found in 8015 and 8006 alloys. Beverage can sheet
is currently one of the most valuable uses for recycled aluminum alloys and it requires
a low iron content.
[0022] The ratio of Fe/Si is desirably adjusted so that substantially all of the iron and
silicon precipitate to form dispersoids.
[0023] The present alloy contains copper in an amount of at least about 0.1% and up to about
0.3% by weight and preferably between 0.15% and 0.25%. When remaining in solution,
copper acts as a solution strengthening element. The copper contributes to the strength
of the alloy and must be present in an amount adequate to provide desired levels of
strengthening. Also, copper is able to retain its strengthening characteristics to
a great extent after annealing. By remaining in solution after annealing, it is believed
that large quantities of dispersoids can by fortified by the copper remaining in solid
solution. However, while copper increases the strength of the present alloy, amount
excessive to the aforementioned ranges can lead to formation of precipitates that
accelerate corrosion. Accordingly, it is preferable to maintain the copper level at
no more than 0.25% by weight.
[0024] The present alloy contains at least about 0.05% and up to about 0.3% manganese by
weight. Advantageously, the manganese level is at least about 0.1% and, preferably,
the manganese level is between 0.15% and 0.25%. As with the copper content, the manganese
should be present in an amount so that it remains in solution after annealing. The
manganese is believed to fortify the dispersoids of the alloy by remaining in solution.
Also, manganese retards the decrease in yield strength that occurs during annealing
as exhibited by the 1100 and 1200 alloys. However, the manganese content should remain
at the specified levels because higher amounts of manganese results in difficulty
when cold rolling. Therefore, the manganese content should be controlled as a level
at which strength remains high after annealing, but the reliability of the alloy is
not significantly affected.
[0025] The magnesium level of the present alloy should be maintained at no greater than
0.01%. The magnesium level should not exceed 0.01% as higher levels lead to magnesium
oxidation which results in a dull surface finish. After the alloy is melted and the
composition adjusted within the above described limits, the present alloy may be cast
on a continuous casting machine adapted for making sheet products. Several continuous
casting processes and machines have been developed or are in commercial use today
for casting aluminum alloys specifically for rolling into sheet. These include the
twin belt caster, twin roll caster, block caster, single roll caster and others. These
casters are generally capable of casting a continuous sheet of aluminum alloy less
than 5cm (2 inches) thick and as wide as the design width of the caster. Optionally,
the continuously cast alloy can be rolled to a thinner gauge immediately after casting
in a continuous hot rolling process. This form of casting produces an endless sheet
of relatively wide, relatively thin alloy. After continuous casting, the aluminum
is coiled and cooled to room temperature. Typically, the continuously cast sheet will
have a thickness of less than about 2.54 cm (1.0 inch) and, if rolled immediately
after casting, may have a thickness of about 0.127 to 0.254 cm (0.05 to 0.1 inches)
when coiled.
[0026] Cold rolling is then conducted in multiple passes with an interanneal provided after
the first or second pass while the sheet is at an intermediate gauge. The interanneal
is performed so that the foil can be rolled to a final, desired gauge more easily.
The interanneal can be performed at between about 250°C or 450°C for a period of about
5 minutes to about 6 hours. Without the interanneal, the alloy may incur an undesirable
amount of work hardening which in turn makes further rolling of the alloy into foil
difficult. Cold rolling is then continued to reduce the thickness of alloy from the
intermediate gauge sheet with a thickness of about 0.05 to about 1.0 cm (0.02 to about
0.4 inches) to a final desired gauge.
[0027] The present alloy produced in this fashion achieves a dispersoid content of at least
1% and advantageously 2% or higher, and preferably 2.5% or more. Furthermore, the
decrease of yield strength during annealing is retarded by the manganese and copper.
Thus, a new alloy having a yield strength similar to 8006 and 8015 alloys in combination
with the desirable cold rolling and recyclability properties found in the conventional
aluminum foil alloys 1100 and 1200 can be formed.
[0028] The complex strengthening mechanism achieved in the aluminum foil product of this
invention is the result of striking a unique balance between two often competing strengthening
mechanisms; i.e., solid solution strengthening and dispersoids (or particulate) strengthening.
It is well know that during the heating and rolling of aluminum, elements and compounds
in the aluminum alloy are dynamically dissolving and precipitating, continually changing
the chemical and physical properties of the alloy. Elements such as copper and manganese
increase the strength of the alloy when they are in solid solution, and dispersoids
(particulates) such as Al
3Fe, Al
12Fe
3Si, Al
9Fe
2Si
2, Al
6Mn, Al
15Fe
3Si
2, Al
12Mn
3Si
2 and others impart strength when they form particles of less than two micron dispersoids
in the aluminum alloy.
[0029] The balance struck between these two strengthening mechanisms in the present invention
produces an aluminum foil product having good strength that is economical to produce
and highly valued in the recycling stream. This is a combination of properties that
has not previously been achieved.
EXAMPLES
[0030] An alloy of the present invention was cast with the composition, by weight, of:-
0.32% silicon,
0.65% iron,
0.20% copper,
0.25% manganese,
with the balance aluminum and
incidental impurities.
[0031] This alloy was cast using a belt caster and immediately rolled while still hot to
a thickness of 0.14478cm (0.057 inches) to produce a coil. It was further cold rolled
to a thickness of 0.056 cm (0.022 inches) and interannealed for 2 hours at 275°C.
After the interanneal, the alloy was rolled to a final thickness of 0.00155 cm (0.00061
inches) and annealed at 330°C for two hours. The properties of this Example can be
seen in Table 2 below.
[0032] Another sample was cast and rolled to final gauge using a procedure to that used
for Sample 1 except the interanneal was conducted at 425°C and the sample had a composition
by weight of 0.32% silicon, 0.55% iron, 0.14% copper and 0.07% manganese. The properties
of this Sample 2 can also be seen in Table 2 below.
[0033] A third Sample was prepared with the composition by weight of 0.06% silicon, 0.65%
iron, 0.18% copper and 0.15% manganese. This third Sample was cast and rolled to final
gauge by the procedure described above for Example 2 except that Sample 3 was interannealed
at 275°C. The properties of Sample 3 can be seen in Table 2 below.
[0034] Finally, a fourth Sample was interannealed at 425°C. Sample 4 had the same composition
by weight as Sample 3 but was produced with a different interanneal temperature.
Table 2
Properties of Example Alloys |
Sample |
UTS MPa(ksi) |
YS |
Mullen |
Elong (%) |
1 |
141.5 (20.53) |
17.98 |
16.5 |
1.2 |
2 |
75.8 (11.0) |
5.74 |
13.3 |
3.2 |
3 |
87.6 (12.7) |
8.3 |
9.8 |
3.5 |
4 |
80.7 (11.7) |
5.7 |
14.0 |
3.5 |
[0035] The yield strength (YS) and elongation (Elong %) were determined according to ASTM
test method E8.
[0036] As can be seen in Table 2, the properties of Sample 1 are very similar to those of
8015. Also, Sample 1 had a particulate content of about 2.8%. However, Sample 1 avoids
the extremely high iron content of 8015 that results in recycling difficulties.
[0037] Samples 2, 3 and 4 had either a lower manganese and copper content and thus have
a lower concentration of solid solution and/or a lower particulate content than Sample
1. Also, these Samples 2 and 4 were intereannealed at a higher temperature used when
the foil was formulated. The high interanneal temperature coupled with the aforementioned
low concentration of elements in solid solution and low particulate content lead to
these examples having inferior properties compared to alloy 8015.
[0038] In summary, the present invention teaches a new aluminum based alloy composition
for use as a household aluminum foil that has enhanced strength properties. Sample
1 evidences a yield strength and ultimate tensile strength that is comparable to that
of alloys 8015 and 8006. While having strength properties comparable to these high
iron content alloys, the present alloy retains the formability and desired recyclability
of the 1100 and 1200 alloys with lower amounts of iron than those found in 8015 and
8006 alloys. The present alloy exhibits the properties of 8015 and 8006 alloys while
retaining ease of recycling. Also, the present invention teaches a cost efficient
of manufacturing the alloy into household aluminum foil.
1. A recyclable aluminum foil having a thickness of less than 0.0254 cm (0.01 inches)
characterized in that said foil results from a continuous strip casting process and is made of an alloy
containing 0.2%-0.5% Si, 0.4%-0.8% Fe, 0.1%-0.3% Cu, and 0.05%-0.3% Mn by weight,
with the balance aluminum and incidental impurities, said foil containing at least
2% by weight of strengthening particulates and having at least 0.1% by weight of said
copper and/or manganese retained in solid solution.
2. A foil according to claim 1, characterized in that said foil contains at least 0.15% and less than 0.3% manganese.
3. A foil according to claim 1 or claim 2, characterized in that said foil contains no more than 0.25% copper.
4. A foil according to claim 1, claim 2 or claim 3, characterized in that said foil contains at least 0.25% and less than 0.4% silicon.
5. A foil according to claim 1, claim 2, claim 3, or claim 4, characterized in that said foil contains at least 0.5% and less than 0.7% iron.
6. A foil according to claim 1, claim 2 or claim 3, characterized in that said foil contains at least 0.25% and less than 0.4% silicon and having at least
0.5% and less than 0.7% iron.
7. An alloy sheet having a thickness of less than 0.0254 cm (0.01 inches), characterized in that said sheet results from a continuous strip casting process and contains 0.2%-0.5%
Si, 0.4%-0.8% Fe, 0.1%-0.3% Cu, and 0.1%-0.3% Mn by weight, with the balance aluminum
and incidental impurities, having a yield strength of at least 68.9 MPa (10 ksi) in
the fully annealed condition.
8. An alloy sheet according to claim 7, characterized in that said alloy contains at least 0.25% and less than 0.4% silicon.
9. An alloy sheet according to claim 7 or claim 8, characterized in that said alloy contains at least 0.5% and less than 0.7% iron.
10. An alloy sheet according to claim 7, characterized in that said alloy contains at least 0.25% and less than 0.4% silicon and having at least
0.5% and less than 0.7% iron.
11. A method of manufacturing a sheet of aluminum-based alloy, in which a sheet of alloy
is cast by continuous strip casting to form a cast sheet less than 5 cm (2 inches)
thick, the cast sheet is coiled, the coiled sheet is cold rolled to final gauge by
a procedure involving several passes, the sheet being interannealed at a temperature
in the range of 250 to 450°C after a first pass and rolled to final gauge in one or
more subsequent passes, characterized in that said alloy contains, by weight, at least 0.2% and up to 0.5% silicon, at least 0.4%
and up to 0.8% iron, at least 0.1% and up to 0.3% copper, at least 0.1% and up to
0.3% manganese, and the balance aluminum and incidental impurities.
12. A method according to claim 11, characterized in that the alloy has a particulate content of at least 2.0%.
13. A method according to claim 11 or claim 12, characterized in that said final gauge is less than 0.0254 cm (0.010 inches) thick.
14. A method according to claim 11, 12 or 13, characterized in that said alloy contains at least 0.1% by weight of said copper and/or manganese retained
in solid solution.
15. A method according to claim 11, 12, 13 or 14, characterized in that said alloy contains at least 0.15% and less than 0.3% manganese.
16. A method according to claim 11, 12, 13, 14 or 15, characterized in that said alloy contains no more than 0.25% copper.
17. A method according to claim 11, 12, 13, 14, 15 or 16, wherein said alloy contains
at least 0.25% and less than 0.4% silicon.
1. Recycelfähige Aluminiumfolie mit einer Dicke von weniger als 0,0254 cm (0,01 Inches),
dadurch gekennzeichnet, dass diese Folie aus einem kontinuierlichen Bandgussverfahren erzeugt ist und aus einer
Legierung, enthaltend 0,2-0,5 Gew.-% Si, 0,4-0,8 Gew.-% Fe, 0,1-0,3 Gew.-% Cu sowie
0,05-0,3 Gew.-% Mn mit dem Restaluminium und unvermeidliche Verunreinigungen, wobei
die Folie zumindest 2 Gew.-% verstärkender Partikel enthält und zumindest 0,1 Gew.-%
des Kupfers und/oder Mangans in fester Lösung aufweist.
2. Folie gemäß Anspruch 1, dadurch gekennzeichnet, dass diese Folie zumindest 0,15 % und weniger als 0,3 % Mangan enthält.
3. Folie gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, dass diese Folie nicht mehr als 0,25 % Kupfer enthält.
4. Folie gemäß Anspruch 1, Anspruch 2 oder Anspruch 3, dadurch gekennzeichnet, dass diese Folie zumindest 0,25 % und weniger als 0,4 % Silizium enthält.
5. Folie gemäß Anspruch 1, Anspruch 2, Anspruch 3 oder Anspruch 4, dadurch gekennzeichnet, dass diese Folie zumindest 0,5 % und weniger als 0,7 % Eisen enthält.
6. Folie gemäß Anspruch 1, Anspruch 2 oder Anspruch 3, dadurch gekennzeichnet, dass diese Folie zumindest 0,25 % und weniger als 0,4 % Silizium enthält und zumindest
0,5 % und weniger als 0,7 % Eisen aufweist.
7. Legierungsblech mit einer Dicke von weniger als 0,0254 cm (0,01 Inches), dadurch gekennzeichnet, dass dieses Blech aus einem kontinuierlichen Bandgussverfahren erzeugt ist und 0,2-0,5
Gew.-% Si, 0,4-0,8 Gew.-% Fe, 0,1-0,3 Gew.-% Cu sowie 0,1-0,3 Gew.-% Mn, Restaluminium
und unvermeidliche Verunreinigungen, enthält, eine Streckgrenze von zumindest 68,9
MPa (10 ksi) im vollvergüteten Zustand aufweist.
8. Legierungsblech gemäß Anspruch 7, dadurch gekennzeichnet, dass diese Legierung zumindest 0,25 % und weniger als 0,4 % Silizium enthält.
9. Legierungsblech gemäß Anspruch 7 oder Anspruch 8, dadurch gekennzeichnet, dass die Legierung zumindest 0,5 % und weniger als 0,7 % Eisen enthält.
10. Legierungsblech gemäß Anspruch 7, dadurch gekennzeichnet, dass die Legierung zumindest 0,25 % und weniger als 0,4 % Silizium enthält und zumindest
0,5 % und weniger als 0,7 % Eisen aufweist.
11. Verfahren zum Herstellen eines Blechs aus einer aluminiumbasierenden Legierung, in
der ein Blech aus einer Legierung mittels kontinuierlichem Bandgießen vergossen wird,
um ein gegossenes Blech mit einer Dicke von weniger als 5 cm (2 Inches) auszuformen,
bei der das gegossene Blech aufgehaspelt wird, das aufgehaspelte Blech auf eine Enddicke
mittels einer Prozedur mit verschiedenen Walzstichen kaltgewalzt wird, das Blech bei
einer Temperatur im Bereich von 250 bis 450°C nach einem ersten Walzstich zwischengeglüht
wird und in einem oder mehreren nachfolgenden Walzstichen auf eine Enddicke gewalzt
wird, dadurch gekennzeichnet, dass diese Legierung zumindest 0,2 Gew.-% und bis zu 0,5 Gew.-% Silizium, zumindest 0,4
Gew.-% und bis zu 0,8 Gew.-% Eisen, zumindest 0,1 Gew.-% und bis zu 0,3 Gew.-% Kupfer,
zumindest 0,1 Gew.-% und bis zu 0,3 Gew.-% Mangan, sowie Restaluminium und unvermeidliche
Verunreinigungen, enthält.
12. Verfahren gemäß Anspruch 11, dadurch gekennzeichnet, dass die Legierung einen Partikelgehalt von zumindest 2,0 % aufweist.
13. Verfahren gemäß Anspruch 11 oder Anspruch 12, dadurch gekennzeichnet, dass die Enddicke weniger als 0,0254 cm (0,010 Inches) beträgt.
14. Verfahren gemäß Anspruch 11, 12 oder 13, dadurch gekennzeichnet, dass die Legierung zumindest 0,1 Gew.-% des Kupfers und/oder Mangans in fester Lösung
enthält.
15. Verfahren gemäß Anspruch 11, 12, 13 oder 14, dadurch gekennzeichnet, dass die Legierung zumindest 0,15 % und weniger als 0,3 % Mangan enthält.
16. Verfahren gemäß Anspruch 11, 12, 13, 14 oder 15, dadurch gekennzeichnet, dass die Legierung nicht mehr als 0,25 % Kupfer enthält.
17. Verfahren gemäß Anspruch 11, 12, 13, 14, 15 oder 16, wobei diese Legierung zumindest
0,25 % und weniger als 0,4 % Silizium enthält.
1. Feuille d'aluminium recyclable ayant une épaisseur de moins de 0,0254 cm (0,01 pouce),
caractérisée en ce que ladite feuille résulte d'un procédé de coulée de bande continue, et qu'elle est faite
d'un alliage contenant 0,2 % à 0, 5 % de Si, 0,4 % à 0,8 % de Fe, 0,1 % à 0,3 % de
Cu et 0,05 % à 0,3 % de Mn en poids, avec le reste en aluminium et en impuretés accidentelles,
ladite feuille contenant au moins 2 % du poids de particules de renforcement et ayant
au moins 0,1 % du poids desdits cuivre et/ou manganèse retenus en solution solide.
2. Feuille selon la revendication 1, caractérisée en ce que ladite feuille contient au moins 0,15 % et moins de 0,3 % de manganèse.
3. Feuille selon la revendication 1 ou la revendication 2, caractérisée en ce que ladite feuille ne contient pas plus de 0,25 % de cuivre.
4. Feuille selon la revendication 1, la revendication 2 ou la revendication 3, caractérisée en ce que ladite feuille contient au moins 0,25 % et moins de 0,4 % de silicium.
5. Feuille selon la revendication 1, la revendication 2, la revendication 3 ou la revendication
4, caractérisée en ce que ladite feuille contient au moins 0,5 % et moins de 0,7 % de fer.
6. Feuille selon la revendication 1, la revendication 2 ou la revendication 3, caractérisée en ce que ladite feuille contient au moins 0,25 % et moins de 0,4 % de silicium et ayant au
moins 0,5 % et moins de 0,7 % de fer.
7. Feuillet d'alliage ayant une épaisseur de moins de 0,0254 cm (0,01 pouce) caractérisé en ce que ledit feuillet résulte d'un procédé de coulée de bande continue et contient 0,2 %
à 0,5 % de Si, 0,4 % à 0,8 % de Fe, 0,1 % à 0,3 % de Cu et 0,1 % à 0,3 % de Mn en
poids, avec le reste en aluminium et en impuretés accidentelles, ayant une limite
d'élasticité d'au moins 68,9 MPa (10 ksi) en condition totalement recuite.
8. Feuillet d'alliage selon la revendication 7, caractérisé en ce que ledit alliage contient au moins 0,25 % et moins de 0,4 % de silicium.
9. Feuillet d'alliage selon la revendication 7 ou la revendication 8, caractérisé en ce que ledit alliage contient au moins 0,5 % et moins de 0,7 % de fer.
10. Feuillet d'alliage selon la revendication 7, caractérisé en ce que ledit alliage contient au moins 0,25 % et moins de 0,4 % de silicium et ayant au
moins 0,5 % et moins de 0,7 % de fer.
11. Procédé de fabrication d'un feuillet d'alliage à base d'aluminium, dans lequel un
feuillet d'alliage est coulé par une coulée de bande continue, pour former un feuillet
de coulée inférieur à 5 cm (2 pouces) d'épaisseur, le feuillet coulé est enroulé,
le feuillet enroulé est laminé à froid jusqu'au gabarit final, par une procédure impliquant
plusieurs passages, le feuillet étant inter-recuit à une température comprise dans
le domaine de 250 à 450 °C après un premier passage et laminé jusqu'au gabarit final
en un ou plusieurs passages subséquents, caractérisé en ce que ledit alliage contient, en poids, au moins 0,2 % et jusqu'à 0,5 % de silicium, au
moins 0,4 % et jusqu'à 0,8 % de fer, au moins 0,1 % et jusqu'à 0,3 % de cuivre, au
moins 0,1 % et jusqu'à 0,3 % de manganèse et l'équilibre en aluminium et en impuretés
secondaires.
12. Procédé selon la revendication 11, caractérisé en ce que l'alliage a une teneur en particules d'au moins 2,0 %.
13. Procédé selon la revendication 11 ou la revendication 12, caractérisé en ce que ledit gabarit final est inférieur à 0,254 cm (0,010 pouce) d'épaisseur.
14. Procédé selon la revendication 11, 12 ou 13, caractérisé en ce que ledit alliage contient au moins 0,1 % du poids desdits cuivre et/ou manganèse retenus
en solution solide.
15. Procédé selon la revendication 11, 12, 13 ou 14, caractérisé en ce que ledit alliage contient au moins 0,15 % et moins de 0,3 % de manganèse.
16. Procédé selon la revendication 11, 12, 13, 14 ou 15, caractérisé en ce que ledit alliage ne contient pas plus de 0,25 % de cuivre.
17. Procédé selon la revendication 11, 12, 13, 14, 15 ou 16, caractérisé en ce que ledit alliage contient au moins 0,25 % et moins de 0,4 % de silicium.